US10524242B2 - User equipment and uplink data transmission method - Google Patents

User equipment and uplink data transmission method Download PDF

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Publication number
US10524242B2
US10524242B2 US15/125,381 US201515125381A US10524242B2 US 10524242 B2 US10524242 B2 US 10524242B2 US 201515125381 A US201515125381 A US 201515125381A US 10524242 B2 US10524242 B2 US 10524242B2
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base station
uplink data
transmission
user equipment
transmission buffer
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US20170079015A1 (en
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Hideaki Takahashi
Tooru Uchino
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NTT Docomo Inc
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NTT Docomo Inc
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • H04W72/042—
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/10—Flow control; Congestion control
    • H04L47/30—Flow control; Congestion control in combination with information about buffer occupancy at either end or at transit nodes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
    • H04L5/001—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT the frequencies being arranged in component carriers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0032—Distributed allocation, i.e. involving a plurality of allocating devices, each making partial allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0058—Allocation criteria
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/0231—Traffic management, e.g. flow control or congestion control based on communication conditions
    • H04W28/0236—Traffic management, e.g. flow control or congestion control based on communication conditions radio quality, e.g. interference, losses or delay
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/0278—Traffic management, e.g. flow control or congestion control using buffer status reports
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/08—Load balancing or load distribution
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/10—Flow control between communication endpoints
    • H04W28/14—Flow control between communication endpoints using intermediate storage
    • H04W72/0413—
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/15—Setup of multiple wireless link connections
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0044—Arrangements for allocating sub-channels of the transmission path allocation of payload
    • H04W72/1284—
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/21—Control channels or signalling for resource management in the uplink direction of a wireless link, i.e. towards the network

Definitions

  • the present invention relates to a radio communication system.
  • LTE-Advanced Long Term. Evolution
  • 3GPP 3 rd Generation Partnership Project
  • CA carrier aggregation
  • CC component carrier having the maximum bandwidth of 20 MHz supported by the LTE systems is used as a basic component, and it is designed to achieve communication in a broader band by using these multiple component carriers simultaneously.
  • UE user equipment
  • eNB evolved NodeB
  • PCell primary cell
  • SCell secondary cell
  • the primary cell is similar to a serving cell in the LTE systems and serves as a cell to ensure connectivity between the user equipment and a network.
  • the secondary cell is a cell configured for the user equipment additionally to the primary cell. Addition and deletion of the secondary cell are performed with an RRC (Radio Resource Control) configuration.
  • RRC Radio Resource Control
  • Rel-10 In the carrier aggregation up to LTE Release 10 (Rel-10), as illustrated in the left side in FIG. 1 , it is defined that user equipment uses multiple component carriers served from a single base station to conduct simultaneous communication. Meanwhile, in Rel-12, the carrier aggregation in Rel-10 is further extended, and as illustrated in the right side in FIG. 1 , dual connectivity where the user equipment uses multiple component carriers served from multiple base stations to conduct the simultaneous communication is discussed. For example, if all component carriers cannot be accommodated in a single base station, it is considered that the dual connectivity can be effectively utilized to achieve a throughput nearly equal to that in Rel-10.
  • bearer splitting where user equipment (UE) splits a single EPS (Evolved Packet System) bearer or packet sequence in a predefined manner and uses component carriers served from multiple base stations (eNB# 1 , eNB# 2 ) to transmit the respective split packet sequences simultaneously is discussed.
  • EPS Evolved Packet System
  • the base station eNB# 2 Upon receiving the split packet sequence via CC# 2 , the base station eNB# 2 serving as a non-anchor node forwards the received packet sequence to the anchor base station eNB# 1 .
  • eNB# 1 Upon receiving the packet sequence forwarded from eNB# 2 , eNB# 1 reorders the packet sequence received via CC# 1 and the packet sequence received from eNB# 2 to reconstruct the packet sequence from the user equipment and forwards the reconstructed packet sequence to a core node (CN).
  • CN core node
  • the data amount ratio is not properly set in accordance with the proposed semi-static data amount ratio setting method, there is a likelihood that an uplink throughput cannot be improved. For example, if a throughput sufficient to transmit distributed data cannot be implemented in a certain cell due to degraded communication quality, the data distributed to the cell would be accumulated in a transmission buffer for storing to-be-transmitted uplink data.
  • One or more embodiments of the present invention provide techniques for transmitting uplink data in the dual connectivity efficiently.
  • One aspect of the present invention relates to user equipment having a dual connectivity function to communicate with multiple base stations simultaneously, comprising: a transmission buffer configured to store uplink data for transmission; a buffer status management unit configured to manage a data amount stored in the transmission buffer; and a transmission control unit configured to receive splitting trigger information indicative of a threshold for the data amount stored in the transmission buffer and a first base station to transmit the uplink data stored in the transmission buffer when the stored data amount is smaller than or equal to the threshold and select a base station to transmit the uplink data stored in the transmission buffer from the multiple base stations depending on whether the data amount stored in the transmission buffer is smaller than or equal to the threshold.
  • Another aspect of the present invention relates to an uplink data transmission method for use in user equipment having a dual connectivity function to communicate with multiple base stations simultaneously, the method comprising: receiving splitting trigger information indicative of a threshold for a data amount stored in a transmission buffer for storing uplink data for transmission and a first base station to transmit the uplink data stored in the transmission buffer when the stored data amount is smaller than or equal to the threshold; determining whether the data amount stored in the transmission buffer is smaller than or equal to the threshold; selecting a base station to transmit the uplink data stored in the transmission buffer from the multiple base stations depending on a result of the determination; and transmitting the uplink data to the selected base station.
  • FIG. 1 is a schematic view for illustrating carrier aggregation
  • FIG. 2 is a schematic view for illustrating bearer splitting in dual connectivity
  • FIG. 3 is a schematic view for illustrating a radio communication system according to one or more embodiments of the present invention.
  • FIG. 4 is a block diagram for illustrating an arrangement of user equipment according to one or more embodiments of the present invention.
  • FIG. 5 is a schematic view for illustrating an uplink data transmission operation according to one or more embodiments of the present invention.
  • FIG. 6 is a schematic view for illustrating an uplink data transmission operation according to one or more embodiments of the present invention.
  • FIG. 7 illustrates a table representing index values indicative of buffer size levels according to one or more embodiments of the present invention.
  • FIG. 8 is a flowchart for illustrating an uplink data transmission operation according to one or more embodiments of the present invention.
  • the user equipment having a dual connectivity function to communicate with multiple base stations simultaneously.
  • the user equipment receives splitting trigger information for triggering splitting transmission (bearer splitting) of uplink data to multiple base stations from a master base station.
  • the splitting trigger information indicates a threshold for a data amount stored in a transmission buffer for storing to-be-transmitted uplink data and a base station to transmit the uplink data stored in the transmission buffer when the stored data amount is smaller than or equal to the threshold.
  • the user equipment selects the base station to transmit the uplink data stored in the transmission buffer from the multiple base stations depending on whether the data amount stored in the transmission buffer is smaller than or equal to the threshold.
  • the user equipment when the data amount stored in the transmission buffer is smaller than or equal to the threshold, transmits the uplink data stored in the transmission buffer to the base station indicated in the splitting trigger information, and otherwise if the data amount stored in the transmission buffer is larger than the threshold, the user equipment transmits an amount of uplink data corresponding to the threshold in the uplink data stored in the transmission buffer to the indicated base station and an amount of uplink data exceeding the threshold to another base station.
  • FIG. 3 is a schematic view for illustrating a radio communication system according to one or more embodiments of the present invention.
  • a radio communication system 10 has user equipment 100 and base stations 200 A, 200 B.
  • the radio communication system 10 supports dual connectivity where the user equipment 100 uses component carriers CC# 1 , CC# 2 served from the multiple base stations 200 A, 200 B to conduct simultaneous communication, and as illustrated, the user equipment 100 uses a dual connectivity function to communicate with the master base station (MeNB) 200 A and the secondary base station (SeNB) 200 B.
  • MeNB master base station
  • SeNB secondary base station
  • the user equipment 100 has the dual connectivity function to communicate with the multiple base stations 200 A, 200 B simultaneously.
  • the user equipment 100 may be any appropriate information processing device with a radio communication function such as a smartphone, a mobile phone, a tablet and a mobile router.
  • the user equipment 100 is arranged from a CPU (Central Processing Unit) such as a processor, a memory device such as a RAM (Random Access Memory) and a flash memory, a radio communication device for transmitting and receiving radio signals to/from the base stations 200 A, 200 B and so on.
  • functions and operations of the user equipment 100 as stated below may be implemented by the CPU running data and programs stored in the memory device.
  • the user equipment 100 is not limited to the above-stated hardware configuration and may be arranged from circuits for implementing one or more of operations as stated below.
  • the base stations 200 A, 200 B (which may be collectively referred to as the base stations 200 hereinafter) establish a radio connection to the user equipment 100 to transmit downlink (DL) packets received from network devices, such as an upper station and a server, communicatively connected on a core network (not shown) to the user equipment 100 as well as transmit uplink (UL) packets received from the user equipment 100 to the network devices.
  • the base station 200 A serves as a master base station (MeNB) or a primary base station
  • the base station 200 B serves as a secondary base station (SeNB).
  • the master base station 200 A controls simultaneous communication between the user equipment 100 and the base stations 200 A, 200 B in accordance with the dual connectivity and controls communication with the upper core network (not shown).
  • the master base station 200 A configures the secondary cell CC# 2 served from the secondary base station 200 B for the user equipment 100 and forwards uplink data received via the primary cell CC# 1 and the secondary cell CC# 2 to the core network.
  • the user equipment 100 splits the uplink data into two packet sequences in accordance with a predefined splitting manner and transmits the respective split packet sequences to the master base station 200 A and the secondary base station 200 B via CC# 1 and CC# 2 , respectively.
  • the secondary base station 200 B Upon receiving the split packet sequence from the user equipment 100 , the secondary base station 200 B forwards the received packet sequence to the master base station 200 A.
  • the master base station 200 A Upon receiving the forwarded packet sequence, the master base station 200 A reorders the packets received from the secondary base station 200 B and the packets received from the user equipment 100 via CC# 1 to reconstruct the packet sequence and forwards the reconstructed packet sequence to the core network.
  • FIG. 4 is a block diagram for illustrating an arrangement of the user equipment according to one or more embodiments of the present invention.
  • the user equipment 100 has a transmission buffer 110 , a buffer status management unit 120 and a transmission control unit 130 .
  • the transmission buffer 110 stores uplink data for transmission.
  • the transmission buffer 110 stores uplink PDCP (Packet Data Convergence Protocol) PDUs (Protocol Data Units). Since sequence numbers (PDCP SNs) are assigned to the respective PDCP PDUs, a packet sequence of the PDCP PDUs can be reordered based on the sequence numbers.
  • PDCP Packet Data Convergence Protocol
  • sequence numbers PDCP SNs
  • the buffer status management unit 120 manages a data amount stored in the transmission buffer 110 .
  • the buffer status management unit 120 determines the number of bytes of data stored in the transmission buffer 110 and indicates the determined number of bytes to the transmission control unit 130 .
  • the buffer status management unit 120 may monitor the data amount stored in the transmission buffer 110 and indicate the monitored data amount to the transmission control unit 130 in a periodic manner or in response to occurrence of a predefined indication event.
  • the buffer status management unit 120 may detect the data amount stored in the transmission buffer 110 and indicate the detected data amount to the transmission control unit 130 .
  • the transmission control unit 130 receives splitting trigger information indicative of a threshold for the data amount stored in the transmission buffer 110 and the base station 200 A or the base station 200 B to transmit the uplink data stored in the transmission buffer 110 when the stored data amount is smaller than or equal to the threshold and select the base station 200 A or the base station 200 B to transmit the uplink data stored in the transmission buffer 110 depending on whether the data amount stored in the transmission buffer 110 is smaller than or equal to the threshold.
  • the splitting trigger information indicates information for triggering splitting transmission (bearer splitting) of uplink data to the master base station 200 A and the secondary base station 200 B.
  • the base station 200 indicated in the splitting trigger information may be the base station 200 A or 200 B serving a cell expected to achieve a higher throughput or the base station 200 A or the base station 200 B serving a cell that can stably achieve a throughput higher than or equal to a predetermined level.
  • the threshold may be a data amount for which the throughput higher than or equal to the predetermined level can be ensured by using a cell of the indicated base station 200 .
  • the threshold may be a data amount that can be transmitted by using the maximum radio resources at the indicated base station 200 allowed to be scheduled for the user equipment 100 .
  • the present invention is not limited to it, and the base station and/or the threshold selected in accordance with any appropriate criteria may be used.
  • the transmission control unit 130 may receive the splitting trigger information from the master base station 200 A for dual connectivity.
  • the transmission control unit 130 may transmit the uplink data stored in the transmission buffer 110 to the base station 200 A or the base station 200 B indicated in the splitting trigger information, and when the data amount stored in the transmission buffer 110 is larger than the threshold, the transmission control unit 130 may transmit the uplink data stored in the transmission buffer 110 to the indicated base stations 200 A and 200 B.
  • the transmission control unit 130 may transmit an amount of uplink data corresponding to the threshold in the uplink data stored in the transmission buffer 110 to the indicated base station 200 A or 200 B and an amount of uplink data exceeding the threshold to the other base station 200 A or 200 B.
  • the transmission control unit 130 receives the splitting trigger information from the master base station 200 A, and the splitting trigger information indicates 89272 bytes as the threshold and the master base station 200 A as the base station to transmit the uplink data stored in the transmission buffer 110 during the data amount stored in the transmission buffer 110 being smaller than or equal to 89272 bytes, for example.
  • the data amount stored in the transmission buffer 110 is 6074 bytes, which is below the indicated threshold, and the transmission control unit 130 accordingly transmits the stored uplink data only to the master base station 200 A via CC# 1 .
  • the transmission control unit 130 may indicate the amount of uplink data for transmission to the master base station 200 A to request radio resources to transmit the uplink data.
  • the transmission control unit 130 may indicate the amount of uplink data for transmission to the master base station 200 A in a BSR (Buffer Status Report).
  • BSR Buffer Status Report
  • the master base station 200 A schedules radio resources to transmit 6074 bytes of uplink data for the user equipment 100 .
  • the transmission control unit 130 uses the scheduled radio resources to transmit the uplink data to the master base station 200 A.
  • the transmission control unit 130 starts to transmit the uplink data to the secondary base station 200 B.
  • the transmission control unit 130 may indicate respective data amounts of uplink data for transmission to the master base station 200 A and the secondary base station 200 B to request radio resources to transmit the uplink data.
  • the transmission control unit 130 may indicate the data amounts of uplink data for transmission to the master base station 200 A and the secondary base station 200 B in a BSR.
  • the master base station 200 A schedules radio resources to transmit the 89272 bytes of uplink data for the user equipment 100
  • the secondary base station 200 B schedules radio resources to transmit the 10728 bytes of uplink data for the user equipment 100 .
  • the transmission control unit 130 uses the scheduled radio resources to transmit the uplink data to the master base station 200 A and the secondary base station 200 B.
  • the master base station 200 A is indicated in the splitting trigger information, but the present invention is not limited to it.
  • the secondary base station 200 B may be indicated.
  • the transmission control unit 130 may have correspondence information indicative of association of respective ranges of data amounts stored in the transmission buffer 110 with index values representing the respective ranges, and the transmission control unit 130 may receive the splitting trigger information including the threshold indicated by the corresponding index value. Similarly, the transmission control unit 130 may indicate the respective data amounts of uplink data transmitted to the master base station 200 A and the secondary base station 200 B by the corresponding index values to the master base station 200 A and the secondary base station 200 B.
  • the correspondence information may be arranged in a table form as illustrated in FIG. 7 . According to the correspondence information as illustrated in FIG. 7 , the threshold of 89272 bytes in the examples in FIGS.
  • the master base station 200 A may indicate the threshold by index 45 in the splitting trigger information.
  • the transmission control unit 130 may indicate the data amount of 6074 bytes transmitted to the master base station 200 A by index 32 in a BSR.
  • the transmission control unit 130 may indicate the data amount of 89272 bytes transmitted to the master base station 200 A by index 45 in the BSR and the data amount of 10728 bytes transmitted to the secondary base station 200 B by index 35 in the BSR.
  • the representation of data amounts with the indices can indicate the data amounts with a few number of bits compared to the bit representation of the data amounts.
  • FIG. 8 is a flowchart for illustrating an uplink data transmission operation in the user equipment according to one or more embodiments of the present invention.
  • the user equipment 100 receives splitting trigger information indicative of a threshold for a data amount stored in the transmission buffer 110 for storing uplink data for transmission and the base station 200 A or 200 B to transmit the uplink data stored in the transmission buffer 110 when the stored data amount is smaller than or equal to the threshold.
  • the user equipment 100 may receive the splitting trigger information from the master base station 200 A.
  • the user equipment 100 may have correspondence information indicative of respective ranges of data amounts stored in the transmission buffer 110 with index values representing the respective ranges in advance, and the threshold may be indicated by the index value. It is assumed below that the splitting trigger information, but is not limited to it, indicates the master base station 200 A.
  • the user equipment 100 determines whether the data amount stored in the transmission buffer 110 is smaller than or equal to the threshold.
  • the user equipment 100 selects the base station 200 A or the base station 200 B to transmit the uplink data stored in the transmission buffer 110 from the base stations 200 A and 200 B depending on the determination result at step S 102 .
  • the user equipment 100 transmits the uplink data to the master base station 200 A indicated in the splitting trigger information.
  • the user equipment 100 transmits an amount of uplink data corresponding to the threshold to the master base station 200 A indicated in the splitting trigger information and an amount of uplink data exceeding the threshold, that is, the remaining amount of uplink data, to the secondary base station 200 B.
  • the user equipment 100 may indicate data amounts of uplink data for transmission to the master base station 200 A and/or the secondary base station 200 B in a BSR to request radio resources to transmit the uplink data. Also, the data amounts may be indicated by the index values.
  • 200 A, 200 B base station

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Mobile Radio Communication Systems (AREA)
US15/125,381 2014-03-18 2015-02-26 User equipment and uplink data transmission method Active US10524242B2 (en)

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JP2014-055169 2014-03-18
JP2014055169A JP6148635B2 (ja) 2014-03-18 2014-03-18 ユーザ装置及びアップリンクデータ送信方法
PCT/JP2015/055564 WO2015141425A1 (ja) 2014-03-18 2015-02-26 ユーザ装置及びアップリンクデータ送信方法

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JP (1) JP6148635B2 (zh)
CN (1) CN106105307B (zh)
CL (1) CL2016002297A1 (zh)
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10966221B2 (en) * 2015-02-13 2021-03-30 Nokia Technologies Oy Uplink scheduling with WLAN/3GPP aggregation

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US20170079015A1 (en) 2017-03-16
EP3122114B1 (en) 2022-01-12
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EP3122114A4 (en) 2017-03-22
WO2015141425A1 (ja) 2015-09-24

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